Below is the official list of chunk limits for every item PER CHUNK

Blocks:

HOPPER:

40 PISTON:

15 STICKY_PISTON:

15 OBSERVER:

20 REPEATER:

40 REDSTONE_TORCH:

100 REDSTONE_WALL_TORCH:

100 SPAWNER:

4 Entity Groups:

Animals:

10 List:– Pig– Cow– Horse– Rabbit– Sheep– Chicken

Monsters:

10 List:– Zombie– Skeleton– Slime– Creeper– Squid